Differential Microphone Preamplifiers with Internal Bias and Complete Shutdown

The MAX4060/MAX4061/MAX4062 are differential-input microphone preamplifiers optimized for notebook and PDA audio systems. These devices feature adjustable gain with excellent power-supply rejection and common-mode rejection ratios, making them ideal for low-noise applications in portable audio systems.

The MAX4060/MAX4062 are capable of switching their output between the differential input and a single-ended auxiliary microphone amplifier input. In addition, the MAX4060/MAX4062 have a low-noise microphone bias generator. The differential gain of the MAX4061/MAX4062 is set with a single resistor. The MAX4060 has a fixed gain of 10V/V and is PC99/2001 compliant. The MAX4061 includes a complete shutdown mode. In shutdown, the supply current is reduced to 0.3µA and the current to the microphone bias is cut off for ultimate power savings.

The MAX4060 operates from a 4.5V to 5.5V single supply and the MAX4061/MAX4062 operate from 2.4V to 5.5V. All devices are specified over the extended operating temperature range, -40°C to +85°C. The MAX4060/MAX4061 are available in tiny 8-pin TDFN (3mm x 3mm x 0.8mm) and 8-pin µMAX® packages. The MAX4062 is available in a 10-pin µMAX package.

Applications

* AES-42 Compliant Microphones * Notebook Audio Systems * PDA Audio Systems * Signal Conditioning * Tablet PCs * USB Audio Peripherals

* 2.4V to 5.5V Single-Supply Operation

* Adjustable Gain or Fixed-Gain Options

* High PSRR (86dB at 1kHz)

* High CMRR (70dB at 1kHz)

* Low Input-Referred Noise

* Integrated Microphone Bias

* 750µA Supply Current

* 0.3µA Shutdown Current

* ±4kV ESD Protection (AUXIN)

* Rail-to-Rail Outputs

* THD+N: 0.04% at 1kHz

* Available in Space-Saving Packages

* 8-Pin TDFN (MAX4060/MAX4061)

* 8-Pin µMAX (MAX4060/MAX4061)

* 10-Pin µMAX (MAX4062)